|
Digital Video Recorder (DVR) - This device is capable of accepting one or more video (and sometimes audio) input signals for recording onto digital storage media. A DVR is basically a computer specifically designed to gather and compress video into a digital video format for storage on a hard disk drive or other form of digital media. DVRs are quickly replacing VCR video recorders for security and surveillance purposes without the need for changing tapes. Key differences between DVR and VCR recorders come to available features. Advanced DVRs are capable of accepting multiple video and / audio inputs without the need for bulky and expensive multiplexers or video quads. As well, most DVRs offer built-in motion detection recording (without costly and conspicuous PIR motion sensors), and many can be remotely viewed and played back over the internet. Some models may easily be backed up onto external media for long term archival. These backup methods may include CDs, DVDs, flash media cards, or via USB to a computer or other storage device. ATSS offers several DVR models, all selected for their superior reliability, ease of use, quality of manufacture and variety of useful features.
DVR is an integrated system which accommodates different combination of multiplexers, quads, video recorders and alarm controllers. This system represents a great step forwards beyond any of conventional analogue surveillance systems. The system not only performs monitoring, motion detection, alarm control and different electric/electronic devices control at the same time, but also stores images from camera into hard disk for playback later.
Through networking it can be easily accessible from any where and at any time. Further, the system employs an easy-to-use interface which maximize the efficiency of the surveillance.
We are proud in introduction of this user-friendly systems to you. The system is best equipped with advanced technologies.
Any competitors of this system are far behind the system in image.
Recording device which is a part of a CCTV camera system. The DVR replaces time lapse recorders as well as Multiplexers. They are composed of a computer hard drive and video inputs. Typical configurations include 4 channels, 8 channels, and 16 channels.
There are many advantages to using a digital video recorder such as motion activated recording.
Recording times are based on the amount of disk space available and the frame rate specified.
During the last decade, microprocessor based (digital) technology has made major advances. Processors, hard drives, and computer memory are continuing to increase in speed and ability. In the surveillance industry, these advances have made it possible for recording digital video. A Digital Video Recorder (DVR) retrieves the video from a security camera, multiplexer, or other source, and converts the signal from analog to digital. The digitized video data is then compressed and stored on the DVR’s hard drive.
Video compression (making the data size smaller) allows the digitized video to be stored efficiently. The process of storing the video data on the DVR hard drive is similar to the way your desk top computer stores a word processor or other data file. The file (video image) is ‘marked’ when stored so the user has quick access to it at a later time. Because the DVR operates like a computer, retrieval of data (video) is very fast. A search by event, time and date, or by camera, happens almost instantaneously. The resolution (image size) and quality (amount of compression) are features that can be set by the user and determine how large and how detailed the playback image is on the monitor. Setting the image for full screen playback with optimum detail requires the most data space on the hard drive and will lower the number of hours of video that can be stored before the hard drive is full. An “overwrite when full” feature assures the user that should the hard drive become full, the DVR will continue to record by writing over the oldest video first. Like time lapse recorders, DVRs can be set to record at different frame rates. The fastest any DVR or time lapse can record is 60 fields (images) per second. Setting the recorder to a much slower setting, for example, one image every 8 seconds will greatly extend the total recording time. Like time lapse recorders, DVRs can also be set to event record when triggered by an external trigger such as a door contact, or by a pre-programmed schedule. Adjusting the DVR for the appropriate frame rate, image size, and compression is simplified with on screen menus. Advanced features (some models) allow you to connect to the DVR though the TCP/IP protocol in your desktop or laptop computer. The DVR can be connected to your office’s local area network (LAN) and cameras can be viewed at your PC monitor. If your LAN is connected to a broadband internet connection (DSL or cable), the DVR connected to the LAN can be viewed from home via the internet.
|
